Security forces killed at least 30 civilians on Tuesday in Syria, among them 17 in the eastern protest hub of Deir Ezzor, activists said.

"At least 15 people were killed in different parts of Deir Ezzor which has been raided by tanks and vehicles mounted with machine guns," the Syrian Observatory for Human Rights said, quoting activists at the scene.

Turkey's foreign minister has left for Damascus to press the Syrian leadership into ending the violent crackdown of the five-month old uprising.

Ahmet Davutoglu's visit on Tuesday comes days after Turkey said its patience with its neighbor was running out. Envoys from India, Brazil and South Africa are also slated to arrive in Damascus on Tuesday to appeal for an end to the violence.

Libya's rebel leader disbanded the entire executive branch of his de-facto government Monday, officials said, in a bid to end a major political crisis caused by the assassination of a top rebel general.

Mustafa Abdul Jalil, chairman of the National Transitional Council dismissed several senior officials, including the rebels' finance, defense and information ministers.

The Syrian regime's promises of democratic reforms lack any credibility as long as a violent crackdown on protests in the country continues, Italy's foreign ministry said in a statement on Monday.

"Only an immediate end to violence by Syrian authorities and the start of peaceful dialogue with the opposition and civil society can lend coherence to announcements of reform initiatives or future elections," it said.

Hundreds of people demonstrated in central Tunis Monday to demand that members of the toppled Ben Ali regime be stopped from re-entering the political scene or escaping justice for alleged crimes.

The protest, the latest in a series in Tunisia since Zine el Abidine Ben Ali was forced out in January by a popular uprising, came days after courts freed two ministers in the former system who were facing corruption charges.